Finally, very few Marines are selected out of bootcamp to stand
Presidential Guard. All these Marines go through a rigorous
background checks prior to approval, and are usually Marine
infantrymen (except in the case of HMX-1, those are flight
Marines).

Correction:

A previous version of this story listed these Marines as part of
the White House sentry unit. Former Marine infantry officer
John Connor —
who served with 2nd Battalion, 8th Marines out of Camp LeJeune —
shot me an email with the correct details.